I completely disassembled a Kenmore washer and found that the polypropylene outer tub and tub cap is to fault. Cloth fibres stick to them and the fibres eventually mold and cause the smell. Open your washer and you will find a layer of slime mold all along the top of the outer tub and cap, This is a manufacturers defect (poor design/inappropriate materials) that Kenmore/Sears must be aware of. I suspect many thousands of others are experiencing the same thing. This reeks of class action.